maru.derm Tranexamic Acid Serum Versus The Purest Solutions Brightening Serum Arbutin 2% + Hyaluronic Acid
This brightening serum is formulated around Tranexamic Acid and Alpha-Arbutin to fade the look of dark spots and brighten dull-looking skin.
This brightening serum is formulated around Alpha-Arbutin and Aloe Barbadensis Leaf Juice Powder to fade the look of dark spots and brighten dull-looking skin.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningTranexamic Acid
Astringent
Alpha-Arbutin
Antioxidant
Propylene Glycol
Humectant
3-O-Ethyl Ascorbic Acid
Skin Conditioning
Vaccinium Myrtillus Fruit Extract
Skin ConditioningHydroxyethylcellulose
Emulsion StabilisingGlycyrrhiza Glabra Root Extract
Bleaching
Panthenol
Skin Conditioning
Allantoin
Skin Conditioning
Sodium PCA
Humectant
Sodium Lactate
Buffering
Arginine
Masking
Aspartic Acid
Masking
PCA
Humectant
Valine
MaskingProline
Skin Conditioning
Threonine
Isoleucine
Skin ConditioningHistidine
Humectant
Phenylalanine
Masking
Glycine
Buffering
Alanine
Masking
Serine
Masking
Maltodextrin
Absorbent
Sodium Benzoate
Masking
Potassium Sorbate
Preservative
Citric Acid
Buffering
Tetrasodium EDTA
Sodium Hydroxide
BufferingWater, Tranexamic Acid, Alpha-Arbutin, Propylene Glycol, 3-O-Ethyl Ascorbic Acid, Vaccinium Myrtillus Fruit Extract, Hydroxyethylcellulose, Glycyrrhiza Glabra Root Extract, Panthenol, Allantoin, Sodium PCA, Sodium Lactate, Arginine, Aspartic Acid, PCA, Valine, Proline, Threonine, Isoleucine, Histidine, Phenylalanine, Glycine, Alanine, Serine, Maltodextrin, Sodium Benzoate, Potassium Sorbate, Citric Acid, Tetrasodium EDTA, Sodium Hydroxide
Water
Skin ConditioningAlpha-Arbutin
Antioxidant
Phenethyl Alcohol
MaskingHydroxyethylcellulose
Emulsion StabilisingPropylene Glycol
Humectant
Aloe Barbadensis Leaf Juice Powder
Skin Conditioning
Triethanolamine
Buffering1,2-Hexanediol
Skin Conditioning
Citric Acid
Buffering
Glycerin
Humectant
Sodium Acetate
BufferingCitrus Grandis Peel Water
HumectantSodium PCA
Humectant
Isopropyl Alcohol
Solvent
Pentylene Glycol
Skin Conditioning
Cellulose
Absorbent
Erythritol
Humectant
Carrageenan
Sodium Acetylated Hyaluronate
Humectant
Sodium Hyaluronate
Humectant
Xanthan Gum
EmulsifyingSodium Hyaluronate Crosspolymer
Humectant
Ethylhexylglycerin
Skin ConditioningHydrolyzed Sodium Hyaluronate
Skin Conditioning
Phenoxyethanol
Preservative
Water, Alpha-Arbutin, Phenethyl Alcohol, Hydroxyethylcellulose, Propylene Glycol, Aloe Barbadensis Leaf Juice Powder, Triethanolamine, 1,2-Hexanediol, Citric Acid, Glycerin, Sodium Acetate, Citrus Grandis Peel Water, Sodium PCA, Isopropyl Alcohol, Pentylene Glycol, Cellulose, Erythritol, Carrageenan, Sodium Acetylated Hyaluronate, Sodium Hyaluronate, Xanthan Gum, Sodium Hyaluronate Crosspolymer, Ethylhexylglycerin, Hydrolyzed Sodium Hyaluronate, Phenoxyethanol
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Alpha-Arbutin is a brightening active used to fade dark spots, melasma, and post-acne marks. Structurally, it is a hydroquinone with a sugar molecule attached (but is much gentler than raw hydroquinone).
It has a pretty elegant way of working; it slots into tyrosinase, or the key enzyme that your skin uses to make melanin), and competitively blocks it so your skin produces less pigment over time.
There are two forms of arbutin and alpha is the better one to reach for: it works at lower amounts, absorbs into skin more easily, and has a strong safety record.
The science backs this up too: lab and animal studies confirm it lowers melanin by blocking tyosinase and the more you use (up to a point), the more it works.
Human studies look good too.
A 2024 trial found a cream with 5% alpha-arbutin and 2% kojic acid worked about as well as a prescription melasma cream but with fewer side effects. Another study showed 2% alpha-arbutin paired with 10% Trihydroxybenzoic Acid Glucoside and sunscreen faded dark spots and melasma without causing irritation.
Concentration-wise, most serums land in the 1-2% range.
The EU's Scientific Committee on Consumer Safety concluded that alpha-arbutin is safe in face creams up to 2% and body lotions up to 0.5%.
Overall, this is a well-studied and low-irritation brightener that's a great pick for anyone dealing with uneven skin tone. It also pairs well with vitamin C, niacinamide, and sunscreen.
Learn more about Alpha-ArbutinCitric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes.
Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath.
However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.
Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.
In skincare formulas, citric acid can:
While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.
Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.
Rosacea skin has a lower threshold for acids generally, with 62.5% of rosacea subjects in one study reacting to lactic acid in a sting test. This is why we mark citric acid as a potential rosacea trigger.
However, this ingredient shows up as a pH adjuster or chelator at roughly 0.1-1% in many products. These low levels are unlikely to be an issue for rosacea skin and becomes a potential trigger at exfoliating concentrations (20%). Because everybody's skin is unique, we recommend a patch test if you are unsure.
Learn more about Citric AcidHydroxyethylcellulose is used to improve the texture of products. It is created from a chemical reaction involving ethylene oxide and alkali-cellulose. Cellulose is a sugar found in plant cell walls and help give plants structure.
This ingredient helps stabilize products by preventing ingredients from separating. It can also help thicken the texture of a product.
This ingredient can also be found in pill medicines to help our bodies digest other ingredients.
Learn more about HydroxyethylcellulosePropylene Glycol is a synthetic, colorless, odorless liquid that has been a staple in cosmetics for decades. It is a skin conditioning agent, humectant, and solvent.
As a humectant, it draw water to the skin to reduce flaking and restore suppleness. It's also a solvent that helps dissolve other actives and keeps formulas stable across temperature changes.
The CIR Expert Panel has confirmed this ingredient to be nontoxic and clinical studies show no sensitization at cosmetic use concentrations.
True allergic reactions are quite rare: a 15-year retrospective study of 6,751 patients found only 0.31% had a positive reaction (and less than half were considered clinically relevant).
It seemed that when sensitization does occur, it's most commonly linked to topical medication (like corticosteroids) and not cosmetics. Allergic contact dermatitis also appears largely limited to individuals with underlying skin conditions.
Overall, propylene glycol is a well-studied ingredient that most people can tolerate without issue.
Learn more about Propylene GlycolSodium PCA (the salt of PCA) is one of the most well-established humectants in skincare.
Why is it so special? Your skin already makes it naturally; it's a natural component of your skin's Natural Moisturizing Factor (NMF), or the mix of water-binding compounds inside your skin cells that keeps things soft and hydrated.
As a cosmetic ingredient, it grabs water and holds it in the upper layers of skin to smooth roughness and ease dehydration.
There's some clinical support for the NMF approach with a study showing that a cream built to mimic the skin's NMF significantly boosted hydration.
Safety-wise, this ingredient non-irritating, non-comedogenic, and non-phototoxic in testing, with minimal skin absorption.
It also works really well with other hydrators like glycerin or hyaluronic acid, and typical usage is somewhere between 0.2-4%.
Learn more about Sodium PCAWater. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!
Learn more about Water
